IPA: /əˈdɛpt.nəs/
KK: /əˈdɛptnəs/
The quality of being very skilled or proficient at something.
Her adeptness at solving complex problems impressed everyone in the meeting.
Adeptness → It is formed from "adept" (from Latin "adeptus", meaning having attained or skilled) and the suffix "-ness" (meaning the state or quality of). The word "adeptness" refers to the state of being skilled or proficient in a particular area.
Think of someone who has 'attained' skill ('adeptus') and the '-ness' indicating a state. This helps you remember that 'adeptness' means the quality of being skilled.